Pulsating apparatus for milking machines



April 16, 1929- R. WALLACE, JR 1,709,758

PULSATING APPARATUS FOR MILKING MACHINES Filed Aug. 10,1926

Patented Apr. 16, 1929.

UNITED sir-Ares RoBERT WALLACE, JR, or CASTLE DOUGLASQSCOTLAND;

I means m ames,

rnLsATINe APPARATUs FoR MILKING MAonrnEs; I

Application filed au ust 10, 1926, Serial n 128,477, and in Great Britain Septe niber 10, 1925. 1

This invention comprises an improved type 3 of milking machine pulsator designed chiefly for a machine in'which there is a pulsator v. r tion of several teat cups the teat cups in both cases being of a double walled type in which there isa rigid outer casing and'a flexible inner wall. I e

My' invention hasfor its object to provide an improved pulsator which will be very effective in operation and which can be, easily cleaned.

According to my invention inddouble walled teat cups for'milking machines the space between theouter wall and fiexibleinncr wall is alternately placed under reduced pressure and atmospheric pressure by means of a pulsator having a reciprocating sliding valve member in which is located a ball, piston or the like; the

valve member being moved in one direction when the'space between the outer wall and inner flexible wall is'underreduced pressure to allow the passage of air to said space, and'the ball, piston or the like raised within said memher by the inrushing air, and moved in the r,e

verse direction whenatmospheric pressure has been attained within said space by the impact of the ball, piston or the like falling within the valve member. I

According to a preferred construction of my inventionthe pulsator is provided with a valve chamber, ducts or passages leading therefrom to the interior of the teat'cup and to the space between the outer and inner walls thereof and provided with an air inlet port, a

hollow sliding valve member located'within said chamber and having openings ate'achiend thereof, and a ball, piston'or the like fitting 7 loosely and capable ofa limited movement within said valve member, the 'constructlon and arrangement being suchthat, when the 1nterior of the cup and said space are both under reducedpressure the valve member is raised and closes the-passage or duct leading to' the interior of the cup and uncovers said airinlet port the inrushingair passing through the valve member, raising the ball, piston or the if like located therein and passing to thesaid space, and when atmospherlc pressure has been attained in sa d space the ball, piston or to the interior of the cup.

member ewhjich consists of a cylinder closed atboth ends and perforated in the ends air valve seat for the lower conical projection z".

the like, falls 'andby impacting'on the valve member nioves the latter to again close the air inlet port and open the'passageor ductleading In order that my inventionmay be properly understood, I have hereunto appended an eX- planatory sheet of drawings whereo'n'; 1 7' Figure l-is a sectional elevation of a double walled teat cu having oneembodiment of my improvemei'its applied thereto and Fignre'2 is an inverted plan "View thereof with Ivalve chamber removed. l i V 1 Referring to the drawings r a is the rigid outer-wall ofthe teat cup, 6 the flexible inner walhp the spacebetween the teat and outer wall, g'the valve chamber, e

the sliding valve mber nd f the ball located therein} i .7

The teat cup is mounted on a plug Z to the base of which is secured a cylinder closed at its lower end and which constitutes the valve chamber g. Located and eapableofaslidingmovement within: this chamber "is the'fvalve holes 7L. 4 in the centre of each en d is a'conica-l projection z and j which constitute the valves proper. I 1 Located and capable 015a risingand falling movement within the valve meinber is the "ball f In the center of the lower end of the valve chamber is an air inlet portlc' which also forms In'the .teat cup plugl are two passages o'r ducts 'm and ntheforiner' leading to the inte rlor ofthe teat cup and the latter leading to i the space 0.' I l V V The lower end of passage forms a valve seat for the conical projection r The valve chamber v is] conveniently formed integral-with its lower closed end and "the other end thereof is ibutted against: the

teat cup plug Z makingv an airj tight joint with it. .ltiskept againsttheplug by the." pressure of ascrew pin 0 working through the end of an outer cylinder or 'cas'ing which is anchoredto the plug by a bayonet joint "but any other means of ointing may be used.

An air hole 19 is provided in said outer casing, lhe lnnerend' of said pin 0' bear son cap 9" having holes 3 and which jcap bears on a downwardly projecting annular rim 22 formed on the lower end of the valve chamber.

In action the teat cup is vertical and the pulsator is underneath the teat cup; and the interior of the teat cup being connected by a connection Z carried by the plug and through pipings to a vacuum pump, 1S exhausted. In

the at-rest position, the inner sliding valve member e and the ball 7. are in the lower position, so that the air inletport la is closed by the conical projection i and the lower end of the passage m is uncovered;

. Whenthe teat cup is exhausted air is drawn from the space c'thro'ugh passage 4% and passage m until said space is exhausted. to a predetermined extent. V I r r The atmospheric pressure is then .able to raise the valve member 6 so that the conical projection is clear of its seat. l/Vhen this state has been reached air rushes in through openings" s,through the air inlet port 76 and in endeavouring to get through perforations 7L and restrictedspace between'ball and valve member'it carries valve member and ball to their higher position.

The conical projection then closes the lower end-of passage m. i Should the ball impact on. the top end of the valvemember before said passage is closed such impact serves to accelerate or effect the upward movement of the valve member. r

Air continues to rush in untils'aid space 0 ot the teatcupis filled with fair at atmoshpheric pressure after which the ball having nomeans of support drops to bottom of the valve chamber andbyits impact overcomes the suction on valve j'o'n upper end of valve member and drives down the latter until air inlet port is 1s closed and lower end ofpassage m is again uncovered.

The cycle of operations'is now complete and there'is continued repetition of the cycle so long-as vacuum 1S maintained in the teat c'up..

[By first slackening the screw pin'o and disconnecting therjoint q, the outer casing, valve chamber, valve member and plug are all rendered accessible for cleaning.v

It will be understood that in place of a ball I may provide a piston or other weighted member.

\Vhat Irclaim 1. In double walled teat cups for milking machines a pulsator having a sliding valve member by which the space between the 'walls is placed-under an alternating pressure anda Weighted member capable of relative movement with respect to said valve member and adapted to impact thereon.

'2. In double walled teat cupsfor milking "machines a pulsator having a ,hollowvalve memberby which the space between the walls is placed under an alternating pressure and having an air passage therethrough, and a weighted member located within and eapable of relative movement with respect to said valve member. a

, 8. In double walled teat cups for milking machines a pulsator compris'ing a hollow walls, a hollow sliding cylinder located within said valve casing and provided with an air hole in the top and, bottom thereof, a conical projection on "t-he top and bottom'of said cylinder-adapted to register with the 1 passage leading to the interior of the casing and the air inlet in the valve casing respectively, and a weighted member locatedwitln, in and capable of a relative sliding movemerit with respect tosaid cylindrical mem-.

her. 1 V 1 5. In double walled teat cups "for milking machines a pulsator having a hollow ,valve member 'by which the space between the Walls is placed'under an alternating pressure and having an air passage therethrough, and a ball weighted member located withln and capable of relative movement'with respect to said valve member.

'6. A pulsator for double walled t'eatcups comprising a valve casing having ports for the passage of air therethrouglna recipro Gating valve member located within said casing and arranged to controlthe ports thereof, said valve member also having ports .torjthe passage of: air therethrough, and a weighted member located within said valve member, said weighted member being adapted to beraised relative to the valve casing and valve member and thereafter to fall and impact onsaidvalvejmember and impart a quick movement thereto.

7'. Apulsator for double walled teat 'i'nember by the inrush of air through said comprising a valve casing having portsifor the passage or air therethrough, areclproeating hollow valve member located within said casing and arranged to control the ports ofthe casing, said valve member also having ports for the passage of air therethrough, and a weighted ball located within said valve member, said ball being adapted to be raised relative'to the valve member. by the inrush of air through said casing and valve member and thereafter to fall and impact on the latter.

8. A pul'sator for double walled teat'cups comprising a Valve casing having ports at Within said Valve member and arranged to opposite ends thereof, a hollow reciprocatbe raised With respect thereto by the inrush ing valve member located Within said casing, of air through the casing and Valve mein- 10 conical protuberances on said member arber' and thereafter to fall and impact on the ranged to control the ports in the casing, said latter.

valve member also having ports for the passage of air therethrough, and a ball located l/VALLACE, JR. 

